Dei
- Benedetto Dei
- DEI
- DEI (Dabney Eats It)
- Dale Earnhardt, Inc.
- Darrell Edward Issa
- Dayalbagh Educational Institute
- Dei Rural LLG
- Demisa language
- Destroy Erase Improve
- Deus
- Deus (disambiguation)
- Directed Electronics
- Divide et impera
- Doofenshmirtz Evil Incorporated
- Dutch East Indies
- Public Power Corporation
- Senckenberg German Entomological Institute